How to Install Add-Ins

The Excel® Add-in

Microsoft® has provide the Add-In feature to allow developers to add their own products to Excel's suite of built-in functions. With the Add-in, third parties can include their own macros and functions and add customized menus and wizards to the application.

From the users perspective, Add-in's are easy. All you do is:

  1. Place the files Equation of State.xla and Equation of State.hlp in a common known directory. Microsoft recommends you put add-in files in the subdirectory:

    c:\Program Files\Microsoft Office\Office\Library

    With this location, Excel will find the add-in automatically. Otherwise, you will have to browse for it.


  2. Activate the Add-In via the Add-Ins dialog box shown in Figure 1. If you must, browse to your known directory. Place a check by the desired Add-in before you select OK (Figure 1). In the example below , the Add-in to be installed is "Moon: Equation of State".


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